Grist-mill.



NO MODEL.

PATENTED MAR. 15, 1904.

s. L. SHELBY.

GRIST MILL.

APPLICATION FILED JULY 6, 1903.

2 sunk-sum 1.

Inventor 1- lLuuRRIs warns on warunmga: WASMNGUN, o. r

PATENTED MAR. 15, 1904. I

s. L. SHELBY.

GRIST MILL. APPLICATION FILED JULY 6, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

Inventor By O 4M Attorney v Witnesses Patented. March 15, 1904.

UNITED STATES PATENT @EFICE.

SAMUEL L. SHELBY, OF SALEM, KENTUCKY.

GRIST-IVIILL.

SPECIFICATION fOrming part of Letters Patent N0. 754,903, dated. March15, 1904.

Application filed July 6, 1903. Serial No. 164,418. (No model.)

To aZZ whom it may concern.-

Be it known that I, SAMUEL L. SHELBY, a citizen of the United States,residing. at Salem, in the county of Livingston and State of Kentucky,have invented certain new and useful Improvements in Grist-Mills; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements in grist-mills.

The object of the invention is to provide simple and effective grainsifting or screening mechanism for mills of this character whereby thegrain on its passage from the hopper to the reducer may be thoroughlyscreened or rid of all impurities, thus enabling meal or flour free fromrefuse and of fine appearance and quality to be obtained.

With these and other objects in view the invention consists of certainnovel features of construction, combination, and arrangement of parts,as will be hereinafter more fully described, and particularly pointedout in the appended claims, reference being had to the accompanyingdrawings, in which I Figure 1 is avertical section of a grist-millembodying my invention. Fig. 2 is a horizontal section of the same online 2 2 of Fig. 1. Fig. 3 is a perspective View of the screen or sieve,and Fig. 4 is a similar view of the refuse chute or conductor.

Referring now more particularly to the drawings, the numeral 1represents the frame or casing of the grist-mill, which may be ofsuitable form, and in which is arranged a reducing device, consisting ofthe burs or millstones 3 and 4, which act upon the grain to grind itinto meal or flour. As shown in the presentinstance, thelower bur 3 isstationary, while the upper bur 4 revolves and is driven by the shaft 5,which has a drive-pulley 6 re ceiving motion from a suitable source ofpower. The revoluble bur or millstone 4is provided with the usual inletopening through "which the grain passes between the stones, and

to said bur is also connected a shaft 7, which extends vertically upinto the upper portion of the casing 1. A conductor 8 is disposedconcentric with said shaft and is adapted to guide the grain to the saidfeed space or opening in the bur i. Disposed, in the upper portion ofthe casing is a hopper 9, containing the grain to be fed to the reducingdevice 2, and disposed below this hopper, so as to take the place of theusual feed-box, is a screen or sieve 10, designed to separate the dust,fine particles of material, and other refuse from the grain prior to itsdischarge into the conductor 8. This sieve or screen 10 comprises aforaminous or perforate shallow pan or troughlike receptacle having aflange or side walls 11 and an outer end wall 12, the opposite end ofthe trough being open to permit the grain after being freed from allimpurities to discharge. Extending from-the inner or lower end of thescreen is a projection 18, which in the present instance is of V form,and to the outer end of this projection is connected a cord or likeelement 14:, which is designed to be secured at 15 to the top of theframe or casing 1. The closed end of the sieve is pivoted at 15 to asuitable support 16, fixed to the casing 1, and from thence the sieve isinclined toward the shaft 7, so as to allow the grain to feed by gravityfrom the inlet end of said sieve below the hopper to the outlet endthereof and thence to the conductor 8. The pivot 15 is vertical andallows the sieve 10 to swing or vibrate laterally and is also looseenough to permit the sieve to have some vertical vplay or movement. Bythis means the sieve may be adjusted vertically by means of the cord orflexible connection 14: to incline to a greater or less extent to suitdifferent conditions of the grain and to effect a fast or slow feed, asdesired. The shaft 7 extends upwardly through the opening 17 in theprojection 13 and is provided with a cam 18, which alternately engagesopposite sides of the wall of said opening 17, and thus vibrates oroscillates the said sieve 10 in a lateral direction, as will be readilyunderstood.

Disposed below the sieve 10 is a chute or conductor 19, the sameconsisting of an imperforate plate or pan provided with inclined sidewalls 20, increasing in depth toward the outer end thereof and having atthe latter a reduced neck or discharge-tube 21 and inclined side wallsor deflectors 22 for guiding the refuse thereto. In practice the refusefalling from the screen 10 drops onto the chute or conductor 19 andpasses by gravity, aided by blasts of air from the fan, hereinafterdescribed, to the discharge-neck 21 and thence falls into arefuse-receptacle 23 on the outside of the casing 1.

In the operation of the apparatus the screen 10 is vibrated laterally bythe shaft 7, which receives motion through the revolution of the bur 4:from the shaft 5, and the grain dropping thereon from the hopper 9 iscaused by such agitation to be loosened up, allowing all dust andparticles of refuse to drop through said screen onto the conductor 19.The grain freed from such impurities is fed toward the shaft 7 anddischarges through the opening 17 into the receptacle 8, and thencepasses in a thoroughly clean condition to the reducing device 2. Thusinstead of the dirt and other refuse being ground up with the grain ameal or flour free from all impurities will be furnished.

It may occur under some conditions that even particles of foreign mattertoo light to feed down through the perforations in the screen 10 maypass with the grain down through the opening 17. In order to preventsuch particles from passing with the grain to the reducing device, Iprovide a fan 23 having a nozzle 24': directed to produce a blast orcurrent of air on a line between the inner ends of the screen andoutlet-chute, so that the light particles of foreign matter passingthrough the opening 17 will be blown outwardly and finally caused todrop upon the chute 19, thus finally ridding the grain of thoseparticles of refuse passing the screen and allowing the grain to feed inan entirely cleanly state to the conductor 8. The fan is driven from theshaft 7 by means of a belt 25, passing around pulleys 26 and 27 on thefan-shaft and the said shaft 7.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and operation of my inventionwill be readily understood without requiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a grist-mill, the combination with a casing, a reducing device inthe lower portion and ahopper on the upper part thereof, and a conductorfor guiding the grain to said reducing device, of asieve having itsreceiving end located below the hopper and pivotedto vibrate laterallyand'having its outlet end 10- catcd above said conductor, the saidscreeninclining downward between the hopper and conductor, means disposed aboxe and coaxi ally with said conductor for acting upon the discharge endof the sieve to vibrate the same,

and a discharge-chute located below the sieve and extending atareverseinclination thereto, having its inner end disposed substantiallyin theplane of the inner end of the screen, and provided at its outer end withan outlet extending to the exterior of the casing, substantially asdescribed.

2. In a grist-mill, the combination with a casing, a reducing device inthe lower portion and a hopper on the upper part thereof, and aconductor for guiding the grain to said reducing device, of a sievehaving its receiving end located below the hopper and pivoted to vibratelaterally, and having its outlet end located above said conductor, thesaid sieve inclining downward between the hopper and conductor, meansdisposed above and coaxially with said conductor for acting upon thedischarge end of the sieve to vibrate the same, a discharge-chutelocated below the sieve and extending at a reverse inclination thereto,having its inner end disposed substantially in the plane of the innerend of the screen, and provided at its outer end with an outlet eX-tending to the exterior of the casing, and a blower within said casingarranged to direct a blast of air over the conductor and on a linebetween the screen and chute, and inversely to the direction of travelof the grain upon the screen, substantially as described,

3. In a grist-mill, the combination with a casing, a reducing devicetherein, and a conductor for guiding the grain to said reducing de vice,of a shaft extending upward from and in coaxial alinement with theconductor, a sieve having its receiving end located below the hopper andpivoted to vibrate laterally and having its outlet end located abovesaid conductor and provided with an extension open for the passage ofthe shaft, the said screen inclining downward between the hopper andshaft, a cam carried by the shaft and acting on the said extension tovibrate the screen, means connected to the tip of the operatingextension'beyond the cam for vertically adjusting the screen, and adischargechute located below the sieve and extending at a reverseinclination thereto, having its inner end disposed substantially in theplane of the inner end of the separating portion of the screen, andprovided at its outer end with an outlet extending to the exterior ofthe casing, substantially as described.

4. In a grist-mill, the combination with a casing, a reducing devicetherein, and a conductor for guiding the grain to said reducing device,of a shaft extending upward thereon and in coaxial alinement with theconductor, a screen or sieve having its receiving end located above saidconductor and comprising a perforated body portion having an outlet atone end and an open frame extension at the opposite end for the passageof said shaft, said screen inclining downward between the hopper andshaft, a cam carried by" the shaft, and acting on the said frameextension to vibrate the screen, and a discharge-chute located below thescreen and extending at a reverse inclination thereto, having its innerend disposed substantially in the plane of the separating portion of thescreen, and comprising a body portion, said flanges deepening toward theoutlet end of the body portion, a dischargespout at the center of theoutlet end, and guides or deflectors between the said flanges and spout.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

SAMUEL L. SHELBY.

Witnesses:

JOHN. V. HAYDEN, J. C. KINSOLVING.

